Computer not reading HDMI adapter

I use a macbook (mid-2010) and use OS X Yosemite. I have used in the past an HDMI adapter to connect my laptop to my TV. However, recently my computer is not reading the adapter. The screen flashes but under devices and under sound preferences no device appears. I checked the HDMI cable with my cable box and it works. The adapter has only been used a couple of times so I don't think that is the problem. Under devices the only option that appears is resolution and brightness. Please help me figure out how to solve this problem. Thank you in advance!

Hello adupre3,
Thanks for the question, and great isolation so far. The following resource provides some additional steps that you can attempt, including checking all of the connections and resetting the PRAM and SMC:
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
http://support.apple.com/en-us/HT201177
Cheers,
Matt M.

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